A triglyceride level less than 150 milligrams per deciliter is considered normal, states MedlinePlus. However, a triglyceride result is not flagged as high unless it reaches 200 milligrams per deciliter.
Triglycerides are a type of fat produced by the body and found in certain foods, explains MedlinePlus. Because extra calories are stored as triglycerides, someone who eats more calories than necessary may also have a high triglyceride level. A high-carbohydrate diet, liver damage, uncontrolled diabetes, hypothyroidism and certain kidney disorders can cause elevated triglyceride levels. Low triglyceride levels are sometimes caused by hyperthyroidism, malnutrition, malabsorption syndrome and low-fat diets.
Lifestyle changes such as losing weight, getting more exercise, and limiting fat and sugar consumption can help reduce high triglyceride levels, reports WebMD.